title: Prolonged excretion of a low-pathogenicity H5N2 avian influenza virus strain in the Pekin duck.
abstract: H5N2 strains of low-pathogenicity avian influenza virus (LPAIV) have been circulating for at least 17 years in some Mexican chicken farms. We measured the rate and duration of viral excretion from Pekin ducks that were experimentally inoculated with an H5N2 LPAIV that causes death in embryonated chicken eggs (A/chicken/Mexico/2007). Leghorn chickens were used as susceptible host controls. The degree of viral excretion was evaluated with real-time reverse transcriptase-polymerase chain reaction (RRT-PCR) using samples from oropharyngeal and cloacal swabs. We observed prolonged excretion from both species of birds lasting for at least 21 days. Prolonged excretion of LPAIV A/chicken/ Mexico/2007 is atypical.
authors.affiliation: Departamento de Medicina y Zootecnia de Aves, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Ciudad de México 04510, México.
authors.forename: José Manuel
authors.initials: JM
authors.lastname: Carranza-Flores
authors.forename: Luis
authors.initials: L
authors.lastname: Padilla-Noriega
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Loza-Rubio
authors.forename: Gary
authors.initials: G
authors.lastname: García-Espinosa
mesh_terms: D000818:Animals; D002645:Chickens; D002988:Cloaca / Q000821:virology; D004372:Ducks; D053125:Influenza A Virus, H5N2 Subtype / Q000502:physiology*; D005585:Influenza in Birds / Q000503:physiopathology* / Q000821:virology; D009960:Oropharynx / Q000821:virology; D011201:Poultry Diseases / Q000503:physiopathology / Q000821:virology; D060888:Real-Time Polymerase Chain Reaction / Q000662:veterinary; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000662:veterinary; D013997:Time Factors; D017201:Virus Shedding
keywords: H5N2 subtype; ducks; influenza A virus; pathogenicity; poultry